4. Jan Haveman (Jan Jans ) was born on 30 Mar 1740 in Ruinerwold. He died on 31 Mar 1820 in Smilde.
Jan married 1 Marchien Alberts Oostinck (Oost) daughter of Albert Wessels Oostinck and Marchien Jakobs on 6 Nov 1765 in Vledder. Marchien was born in 1742 in Vledder. She was christened on 7 Oct 1742. She died on 19 Jun 1813 in Smilde.
They had the following children:
+ 6 M i Albert Haveman + 7 F ii Jacobjen Haveman 8 M iii Jan Haveman was christened 1 on 25 Nov 1770 in Vledder. + 9 M iv Jan Jans Haveman + 10 F v Marchien Haveman + 11 M vi Oost Haveman